Octaflow ST-70 is the tin-based liquid catalyst stannous octoate adsorbed onto a silica carrier. The additive may be used in both e-caprolactam blocked polyurethane powder coatings and the internally blocked uretdione systems. Octaflow ST-70 is incorporated as a raw material during the premix stage of processing. A laboratory investigation is recommended to optimize the concentration and processing conditions for a particular formulation. Typical dosage ranges from 0.1 – 1% based on total formula weight.